/*
 * Copyright (c) 2012-2017 Red Hat, Inc.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *   Red Hat, Inc. - initial API and implementation
 */
package org.eclipse.che.api.system.server;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import javax.inject.Inject;
import org.eclipse.che.api.core.notification.EventService;
import org.eclipse.che.api.system.shared.event.service.StoppingSystemServiceEvent;
import org.eclipse.che.api.system.shared.event.service.SystemServiceStoppedEvent;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Terminates system services.
 *
 * @author Yevhenii Voevodin
 */
class ServiceTerminator {

  private static final Logger LOG = LoggerFactory.getLogger(ServiceTerminator.class);

  private final EventService eventService;
  private final List<ServiceTermination> terminations;

  @Inject
  ServiceTerminator(EventService eventService, WorkspaceServiceTermination workspaceTermination) {
    this(eventService, Collections.singletonList(workspaceTermination));
  }

  ServiceTerminator(
      EventService eventService, Collection<? extends ServiceTermination> terminations) {
    this.eventService = eventService;
    this.terminations = new ArrayList<>(terminations);
  }

  /**
   * Terminates system services.
   *
   * @throws InterruptedException when termination is interrupted
   */
  void terminateAll() throws InterruptedException {
    for (ServiceTermination termination : terminations) {
      LOG.info("Shutting down '{}' service", termination.getServiceName());
      eventService.publish(new StoppingSystemServiceEvent(termination.getServiceName()));
      try {
        termination.terminate();
      } catch (InterruptedException x) {
        LOG.error(
            "Interrupted while waiting for '{}' service to shutdown", termination.getServiceName());
        throw x;
      }
      LOG.info("Service '{}' is shut down", termination.getServiceName());
      eventService.publish(new SystemServiceStoppedEvent(termination.getServiceName()));
    }
  }
}
